a, b = 10, 10
print("ab的内存地址分别为：", id(a), id(b))
print("a is b ==>", a is b)
print("a is not b ==>", a is not b)
print("id(a) == id(b) ==>", id(a) == id(b))

b = 20
print("ab的内存地址分别为：", id(a), id(b))
print("a is b ==>", a is b)
print("a is not b ==>", a is not b)
print("id(a) == id(b) ==>", id(a) == id(b))

